As a fairly recent convert (sort of) autoloaders are more popular, because:
They're mostly thinner, therefore easier to conceal
They hold more rounds, important when the zombies come
The dominant calibers are plenty enough, and
They're cheaper.
Not long ago, the predominant pocket pistol was a S&W J-frame packing .38 Spl +P. Still a good choice, but now we have Ruger LCPs, etc. I met two fellows at the range yesterday shooting Sig P238s. Nasty little beasts, and well made. Plus lots of small 9s.
Personally, practically, I've gone to autoloaders in the nightstand, in my waistband, and if it's all I can do, in my pocket (mouse gun). That said, if you want some thump on your belt, you can't beat a sturdy revolver. And I honestly believe that the revolvers coming out of Ruger and Smith & Wesson are as good or better than ever (love my GP-100). Taurus gets little love, but I think they're pretty good guns too (just not as good as the Yankees make).
Numbers, the pistols have it. But revolvers are not going away.